<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡屏视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col
          ><span>请选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader
            expand-trigger="hover"
            :options="catelist"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加 动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态表格参数 面板 -->
          <el-table :data="manyTableData" border>
            <!-- 展开行 type="expand" -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 type="index"-->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template stripe slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加 静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态表格参数 面板 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 type="expand" -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 type="index"-->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
      <!-- 分页区域 -->
    </el-card>
    <!--添加参数的对话框  -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @closed="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!--修改参数的对话框  -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @closed="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        class="demo-ruleForm"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  // 组件状态值
  data () {
    return {
      // 商品分类 列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框 双向绑定到的数值
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: null,
      // 静态属性的数据
      onlyTableData: null,
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: { attr_name: '' },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {
        attr_id: '', attr_name: ''
      },
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      inputValue: ''
    }
  },

  // 组件方法
  methods: {
    // 获取所有商品列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) { return this.$message.error('获取商品分类失败') }
      this.catelist = res.data
      console.log(res.data)
    },
    // 级联选中框选中变化 会触发 这个韩式
    handleChange () {
      this.getParamsData()
    },
    // tab 页签点击事件
    handleTabClick () {
      this.getParamsData()
    },
    // 获取 点击事件的 数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明选中的是三级分类
      const { data: res } = await this.$http.get(
        `categories/${this.catId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      // 字符串 分隔为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals
          ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏  为文本框增加自定义属性 inputVisible inputValue
        item.inputVisible = false
        item.inputValue = ''
      })

      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else { this.onlyTableData = res.data }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数事件
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.catId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })

        if (res.meta.status !== 201) { this.$message.error('添加失败！') }

        this.$message.success('添加成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮 展示修改对话框
    async showEditDialog (attrid) {
      console.log(attrid)
      this.editDialogVisible = true
      // 查询当前参数的信息   { params: { attr_sel: this.activeNam  是提供的新参数
      const { data: res } = await this.$http.get(`categories/${this.catId}/attributes/${attrid}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) { return this.$message.error('获取失败') }
      console.log(res.data)
      // 获取成功后，赋值到当前表单对象中editForm
      this.editForm = res.data
    },
    // 修改参数 动作
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 提交的表单数据对象 { attr_name: '',attr_sel:''}
        const { data: res } = await this.$http.put(`categories/${this.catId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) { this.$message.error('修改失败！') }
        this.$message.success('修改成功！')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    async removeParams (attrid) {
      const confirmResult = await this.$confirm('此操作将永久删除参数，是否继续', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') { return this.$message('已经取消删除') }
      const { data: res } = await this.$http.delete(`categories/${this.catId}/attributes/${attrid}`)
      if (res.meta.status !== 200) { return this.$message.error('删除失败') }
      this.$message.success('删除分类成功')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下了enter都会触发的事件
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return 则证明用户输入了有效内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求 存储到数据库中
      this.saveAttrVals(row)
    },
    // 删除 对应的参数可选项
    async handleClose (i, row) {
      row.attr_vals.splice(i, 1)// splice 修改原数组 i索引 删除一项
      this.saveAttrVals(row)
    },

    // 将对attr_vals 的操作保存到数据库中
    async saveAttrVals (row) {
      // 发起请求 存储到数据库中
      const { data: res } = await this.$http.put(`categories/${this.catId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          // 将变形过后的数组在变回原来的字符串，用空格拼接
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) { return this.$message.error('修改参数项失败') }
      this.$message.success('修改参数项成功')
    },
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick作用：就是当页面上的元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus() // 获取页面输入框焦点
      })
    }
  },
  // 以下是生命周期钩子   注：没用到的钩子请自行删除
  /**
  * 组件实例创建完成，属性已绑定，但DOM还未生成，$ el属性还不存在
  */
  created () {
    this.getCateList()
  },
  // 计算属性
  computed: {
    // 如果按钮被禁用 则返回true 否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      } return false
    },
    // 当前选中的三级分类的Id值
    catId () {
      if (this.selectedCateKeys.length === 3) {
        console.log(this.selectedCateKeys[2])
        return this.selectedCateKeys[2]
      } return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } return '静态属性'
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<!--使用了scoped属性之后，父组件的style样式将不会渗透到子组件中，-->
<!--然而子组件的根节点元素会同时被设置了scoped的父css样式和设置了scoped的子css样式影响，-->
<!--这么设计的目的是父组件可以对子组件根元素进行布局。-->
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
